Multi-Doped Solid-State Electrolyte for Lithium Metal Stability
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Solution Overview
Problem
Current oxide-based solid-state electrolytes, such as LATP, suffer from deterioration due to the redox reaction between titanium (IV) ions and lithium metal, leading to reduced cycle life and stability in lithium-ion batteries.
Innovation Solution
A multiple-doping material with a chemical formula of LixTiyMm(PO4)3 is introduced, where titanium is partially substituted by multiple doping elements, reducing the concentration of titanium (IV) ions and inhibiting their redox reaction with lithium, while maintaining high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based solid-state electrolytes like LATP are used, then ionic conductivity and chemical stability are improved, but titanium (IV) ions react with lithium metal causing deterioration and reduced cycle life
Solution Approach 1:
The patent modifies the chemical composition parameters of the oxide-based solid-state electrolyte by doping with multiple elements (e.g., Al, Ga, In, Sc, Y, La, Ta, Nb, Mo, W) to substitute titanium (IV) ions. This changes the electronic and chemical properties of the material, reducing the reactivity with lithium metal while maintaining ionic conductivity, thereby extending cycle life
Solution Approach 2:
The patent creates a composite material system by combining oxide-based solid-state electrolyte with multiple doping elements. This composite structure integrates the benefits of high ionic conductivity from the oxide matrix with the stability provided by the doping elements, preventing titanium-lithium redox reactions and improving overall reliability and cycle life
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multiple-doping material effectively prevents the deterioration of solid-state electrolytes, enhances their stability against lithium metal, and maintains high ionic conductivity, thereby improving the cycle life and efficiency of lithium-ion batteries.
Implementation Method 1
titanium (IV) ions (Ti4+) on the surface of the LATP pellet 13 will react with the lithium metal of the negative electrode 11 of the battery so as to be reduced to titanium (III) ions (Ti3+) during the discharging process
Implementation Method 2
the lithium-ion batteries using the oxide-based solid-state electrolytes have advantages of high safety, no leakages of toxic solvents, no flammability and volatility, less short-circuiting, easy processability, small size and non-strict storage conditions
Data Source
AI summary
A solid-state electrolyte of a lithium-ion battery is provided. The lithium-ion battery has a negative electrode including a lithium-containing material in contact with the solid-state electrolyte. The solid-state electrolyte includes a multiple-doping material with a chemical formula of LixTiyMm(PO4)3, wherein 0.8≤x≤1.5, 0<y≤0.6, M represents at least three different doping elements, 1.25≤m≤1.7, and y/m≤0.5. The lithium-ion battery using the solid-state electrolyte is also provided.